Broad- and narrow-band imaging of the giant radio galaxy Cygnus A

Details Broad- and narrow-band imaging of the giant radio galaxy Cygnus A Broad- and narrow-band imaging of the giant radio galaxy Cygnus A

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..513c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Aug. 1989, p. 513-523.

Astronomy and Astrophysics

Astronomy

21

Cygnus Constellation, Galactic Structure, Radio Galaxies, Astronomical Maps, Broadband, H Alpha Line, Narrowband, Very Large Array (Vla)

Scientific paper

Optical broadband and narrowband images of Cygnus A have been compared to VLA radio images of the source. The zero-redshift H-alpha image reveals the distribution of ionized Galactic material toward the radio source. The low emission values noted imply that the large amounts of Faraday rotation observed toward the radio lobes of the galaxy must be of extragalactic origin. It is shown that the radio-core source is located between two optical broadband peaks in the galaxy nucleus, and that the radial-surface brightness profiles follows a de Vaucouleurs r exp 1/4 law out to at least 31 kpc. It is suggested that the double optical nucleus observed is not caused by a kiloparsec-scale dust lane, but by polar radiation from a core source that is obscured by a disk.

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